巴氏灭菌技术的杀菌对象是（）。
A、细菌孢子
B、酵母
C、霉菌
D、乳酸杆菌
参考答案：B, C, D
爷爷今年63岁，我今年7岁．
（1）爷爷今年的年龄是我今年年龄的几倍？
（2）爷爷明年的年龄是我明年年龄的几倍？
Green economy offers a new model ______ people could both protect the climate and develop the economy, according to what Li said at the International Cooperative Conference on Green Economy and Climate Change.
A．how
B．why
C．where
D．which
